Cost to Run a 50-watt electric knife sharpener for 20 hours in Illinois
Running a 50-watt electric knife sharpener for 20 hours uses 1 kWh and costs $0.17 at $0.17/kWh in Illinois. Do that every day and it adds up to $5.10 a month.
Calculate your own cost
- Per hour
- $0.0090.05 kWh
- Per day
- $0.171 kWh
- Per week
- $1.197 kWh
- Per month (30 days)
- $5.1030 kWh
- Per year
- $62.05365 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 50-watt electric knife sharpener cost per hour?
At $0.17/kWh, it costs $0.009 per hour. The maths: 50 W ÷ 1,000 = 0.05 kWh per hour, × $0.17 = $0.009.
How much does it cost per month?
Used 20 hours a day for 30 days, it costs about $5.10 per month and uses 30 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
1 kWh per day, 30 kWh per month and 365 kWh per year at 20 hours a day. A kWh is one kilowatt (1,000 W) used for one hour. It is the unit on your electricity bill.
How can I lower the cost?
Follow the device instructions and unplug after use. Check your bill for the exact rate and enter it above.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $3.00 and at 30¢ it is $9.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Illinois
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.05 kWh | $0.009 | $0.255 | $3.10 |
| 2 hours | 0.1 kWh | $0.017 | $0.51 | $6.21 |
| 3 hours | 0.15 kWh | $0.026 | $0.765 | $9.31 |
| 4 hours | 0.2 kWh | $0.034 | $1.02 | $12.41 |
| 5 hours | 0.25 kWh | $0.043 | $1.28 | $15.51 |
| 6 hours | 0.3 kWh | $0.051 | $1.53 | $18.62 |
| 7 hours | 0.35 kWh | $0.06 | $1.79 | $21.72 |
| 8 hours | 0.4 kWh | $0.068 | $2.04 | $24.82 |
| 9 hours | 0.45 kWh | $0.077 | $2.30 | $27.92 |
| 10 hours | 0.5 kWh | $0.085 | $2.55 | $31.03 |
| 11 hours | 0.55 kWh | $0.094 | $2.81 | $34.13 |
| 12 hours | 0.6 kWh | $0.102 | $3.06 | $37.23 |
| 13 hours | 0.65 kWh | $0.111 | $3.32 | $40.33 |
| 14 hours | 0.7 kWh | $0.119 | $3.57 | $43.44 |
| 15 hours | 0.75 kWh | $0.128 | $3.83 | $46.54 |
| 16 hours | 0.8 kWh | $0.136 | $4.08 | $49.64 |
| 17 hours | 0.85 kWh | $0.145 | $4.34 | $52.74 |
| 18 hours | 0.9 kWh | $0.153 | $4.59 | $55.85 |
| 19 hours | 0.95 kWh | $0.162 | $4.85 | $58.95 |
| 20 hours | 1 kWh | $0.17 | $5.10 | $62.05 |
| 21 hours | 1.05 kWh | $0.179 | $5.36 | $65.15 |
| 22 hours | 1.1 kWh | $0.187 | $5.61 | $68.26 |
| 23 hours | 1.15 kWh | $0.196 | $5.87 | $71.36 |
| 24 hours | 1.2 kWh | $0.204 | $6.12 | $74.46 |
How we worked it out
- Energy per hour: 50 W ÷ 1,000 = 0.05 kWh
- Cost per hour: 0.05 kWh × $0.17 = $0.009
- Cost per day: × 20 hours = $0.17
- Month and year: × 30 days = $5.10, × 365 days = $62.05
Illinois electricity prices
Illinois pays about $0.17 per kWh, which is 3% lower than the US average of $0.175. The same electric knife sharpener would cost $5.25 a month at the national average.
What it costs in different places
Same 50-watt electric knife sharpener, 20 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $5.25 |
| California | $0.32 | $9.60 |
| Texas | $0.155 | $4.65 |
| New York | $0.25 | $7.50 |
| Florida | $0.155 | $4.65 |
| Illinois | $0.17 | $5.10 |
| Pennsylvania | $0.18 | $5.40 |
| Ohio | $0.17 | $5.10 |
| Washington | $0.115 | $3.45 |
About electric knife sharpener running costs
Electric knife sharpeners run for only a short time, so energy cost per use is tiny despite the motor’s rated wattage.
Typical sizes: 50 W, 100 W, 150 W, 250 W.
How to spend less: Follow the device instructions and unplug after use.
What this estimate assumes
- The appliance draws its full stated wattage the whole time it is on. Real units with a thermostat cycle off and cost less.
- Wattage is the typical label value, not a measured value. Check the label on your own appliance.
- The rate is an approximate residential average in Illinois. Your bill may include fixed fees, tiers or time-of-use pricing. Edit the rate above.
- A month is 30 days and a year is 365 days.